US8628718B2ActiveUtilityPatentIndex 91

Modified polylactic acid, polymeric blends and methods of making the same

Assignee: LI FENGKUIPriority: Feb 18, 2011Filed: Feb 18, 2011Granted: Jan 14, 2014

Est. expiryFeb 18, 2031(~4.6 yrs left)· nominal 20-yr term from priority

Inventors:LI FENGKUI ASHBAUGH JOHN RAUSCHER DAVID DOTTER ROBERT

B29C 49/0005C08L 15/00B29C 45/0001B29C 48/022B32B 27/08Y10T428/139B29C 48/09B29C 51/002B29C 48/21B29C 48/08B29C 48/05C04B 38/0054B32B 2270/00C04B 40/0245C08L 23/12Y10T428/31797C08L 67/04B32B 7/12B32B 27/36C08L 23/10B32B 27/32F17C 11/002Y10T428/31515B32B 2250/24C08G 63/912C04B 38/0074B29K 2067/046C04B 28/18

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Claims

Abstract

Polymeric compositions and processes of forming the same are discussed herein. The processes generally include contacting a polylactic acid with a reactive modifier selected from epoxy-functionalized polybutadiene, ionic monomer, and combinations thereof.

Claims

exact text as granted — not AI-modified

What is claimed is:

1. A process for forming a polymeric composition comprising melt blending a polylactic acid with a reactive modifier selected from epoxy-functionalized polybutadiene, ionic monomer, and combinations thereof to form a modified polylactic acid during a first step and, subsequently melt blending the modified polylactic acid with a polyolefin to produce a polyolefin-polylactic acid blend during a second step.

2. The process of claim 1 , wherein the polylactic acid is selected from poly(D-lactide), poly(L-lactide), poly(DL-lactide), and combinations thereof.

3. The process of claim 1 , wherein the polylactic acid has a concentration of from about 2 wt. % to about 98 wt. % based on the total weight of the polymeric composition.

4. The process of claim 1 , wherein the reactive modifier contacts the polylactic acid in a concentration of from about 2 wt. % to about 30 wt. % based on the total weight of the polymeric composition.

5. The process of claim 1 , wherein the reactive modifier is an epoxy-functionalized polybutadiene oligomer.

6. The process of claim 1 , wherein the epoxy-functionalized polybutadiene oligomer has a number average molecular weight in a range from about 500 g/mol to about 20000 g/mol.

7. The process of claim 1 , wherein the reactive modifier is an ionic monomer.

8. The process of claim 7 , wherein the ionic monomer is an organometallic salt having acrylate functional groups.

9. The process of claim 1 , wherein the polyolefin is selected from polypropylene, polyethylene, copolymers thereof and combinations thereof.

10. The process of claim 9 , wherein the polyolefin has a concentration of from about 2 wt. % to about 98 wt. % based on the total weight of the polymeric composition.

11. The process of claim 1 , further comprising processing the polymeric composition using one or more polymer processing techniques selected from: film, sheet, pipe and fiber extrusion or coextrusion; blow molding; injection molding; rotary molding; and thermoforming.

12. The polymeric composition formed by the process of claim 1 .

13. A process for forming a polymeric composition comprising:
contacting a polylactic acid with a reactive modifier selected from epoxy-functionalized polybutadiene, ionic monomer, and combinations thereof;
contacting the polylactic acid and the reactive modifier with a polyolefin to produce a polyolefin-polylactic acid blend; and

combining the polyolefin-polylactic acid blend with a second polyolefin and a polyester thereby forming a second blend.

14. The process of claim 13 , wherein the polyolefin, the polylactic acid, and the reactive modifier are melt blended in a single step.

15. The process of claim 13 , wherein the polylactic acid is selected from poly(D-lactide), poly(L-lactide), poly(DL-lactide), and combinations thereof.

16. The process of claim 13 , wherein the polylactic acid has a concentration of from about 2 wt. % to about 98 wt. % based on the total weight of the polymeric composition.

17. The process of claim 13 , wherein the reactive modifier contacts the polylactic acid in a concentration of from about 2 wt. % to about 30 wt. % based on the total weight of the polymeric composition.

18. The process of claim 13 , wherein the reactive modifier is an epoxy-functionalized polybutadiene oligomer.

19. The process of claim 13 , wherein the epoxy-functionalized polybutadiene oligomer has a number average molecular weight in a range from about 500 g/mol to about 20000 g/mol.

20. The process of claim 13 , wherein the reactive modifier is an ionic monomer.

21. The process of claim 20 , wherein the ionic monomer is an organometallic salt having acrylate functional groups.

22. The process of claim 13 , wherein the polyolefin is selected from polypropylene, polyethylene, copolymers thereof and combinations thereof.

23. The process of claim 22 , wherein the polyolefin has a concentration of from about 2 wt. % to about 98 wt. % based on the total weight of the polymeric composition.

24. The process of claim 13 , further comprising processing the polymeric composition using one or more polymer processing techniques selected from: film, sheet, pipe and fiber extrusion or coextrusion; blow molding; injection molding; rotary molding; and thermoforming.

25. The polymeric composition formed by the process of claim 13 .

26. A process comprising:
forming a polymeric composition comprising contacting a polylactic acid with a reactive modifier selected from epoxy-functionalized polybutadiene, ionic monomer, and combinations thereof;
contacting the polylactic acid and the reactive modifier with a polyolefin to produce a polyolefin-polylactic acid blend; and

forming a multilayer film having a polyolefin layer, a polyester layer, and a tie layer disposed between the polyolefin layer and the polyester layer, wherein the tie layer comprises the polyolefin-polylactic acid blend.

27. The process of claim 26 , wherein the polylactic acid is selected from poly(D-lactide), poly(L-lactide), poly(DL-lactide), and combinations thereof.

28. The process of claim 26 , wherein the polylactic acid has a concentration of from about 2 wt. % to about 98 wt. % based on the total weight of the polymeric composition.

29. The process of claim 26 , wherein the reactive modifier contacts the polylactic acid in a concentration of from about 2 wt. % to about 30 wt. % based on the total weight of the polymeric composition.

30. The process of claim 26 , wherein the reactive modifier is an epoxy-functionalized polybutadiene oligomer.

31. The process of claim 26 , wherein the epoxy-functionalized polybutadiene oligomer has a number average molecular weight in a range from about 500 g/mol to about 20000 g/mol.

32. The process of claim 26 , wherein the reactive modifier is an ionic monomer.

33. The process of claim 32 , wherein the ionic monomer is an organometallic salt having acrylate functional groups.

34. The process of claim 26 , wherein the polyolefin is selected from polypropylene, polyethylene, copolymers thereof and combinations thereof.

35. The process of claim 34 , wherein the polyolefin has a concentration of from about 2 wt. % to about 98 wt. % based on the total weight of the polymeric composition.

36. The process of claim 26 , wherein the polyolefin, the polylactic acid, and the reactive modifier are melt blended in a single step.

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